Gun sight



32a-M258 D?? 199070387 SR H B.,INGL|5 ET AL GUN SIGHT Filed March 25, 1930 33. GEOWlETlC/AL lNS l Huww" Patented May 2, 1933 LUNITED STATES PATENT OFFICE HENRY B. INGLIS, 0F BROOKLYN, NEW YORK, AND CHARLES L. PAULUS AND ROBERT KAUCH, OF DAYTON, OHIO' GUN SIGHT Application filed March 25, 1930.

This invention described herein may be manufactured and used by or for the G oveinment for governmental purposes, without the payment to us of any royalty thereon.

This invention relates to improvements in gun sights and more particularly gun sights which are adjustable for the purpose of correcting for range, windage and other factors and has for one of its objects the provision of means for compensating a sight for the drift of a projectile caused by a side wind on the same as a result of a rotation imparted to it by the rifling of the barrel.

This and other features of construction in the arrangement of the parts will appear from the accompanying description and drawing.

In the drawing:

Fig. 1 is a diagrammatic illustration of the Magnus law.

Fig. 2 is a fro-nt end view of the gun sight mounted on the barrel of a gun, the barrel being shown in cross section.

Fig. 3 is a sectional view taken on the line 3 8 of Fig. 2.

It is well known according to the Magnus effect that a rotating cylinder in space yields in the direction perpendicular to the air stream and to the axis of the cylinder and always toward the side on which the peripheral motion of the cylinder coincides with the direction of the air stream. It will be noted in Fig. l of the drawing that the projectile 1, illustrated in the form of a cylinder, is rotated in the direction of the arrow 2 due to the rifling direction in the barrel of the gun. Assuming the wind to be blowing in the d1- rection of the arrow 3, the projectile will be deviated from its normal course, or trajectory in the direction of the arrow 3 by reason of the impingement of the air on the left-hand side of the projectile as viewed in Fig. 1. Since the projectile is rotating in a counterclockwise direction, as viewed in Fig. 1, the defiection of the projectile due to the Magnus effect would be in the direction of the arrow 4 in that the peripheral motion of the cylinder at the bottom coincides with the direction of the air-stream and the resultant Serial No. 438,851.

deflection of the projectile, both due to the wind and Magnus effect, will be in the direction of the arrow 5. It will be quite obvious that since the Magnus effect is dependent upon windage, a single correction in the gun sight corresponding to the direction of the arrow 5 would compensate for both the Mag nus effect and for windage.

Referring to Fig. 2 of the drawing, the gun sight which is of the Springfield rifle type consists of a rear sight leaf 6, an eye-piece carrier 7, and an eye-piece 8. The sight leaf 6 together with the eye-piece 8 and eye-piece carrier 7 form an assembly that is adjustably mounted for simultaneous lateral Vand vertical movement upon a sight base 9. This base is suitably attached to the gun barrel l() which is provided with a rifling 11, spiralled in a direction as to cause the bullet torotate in the direction shown in Fig. 1. Any suitable adjusting means may be used for simultaneously laterally and vertically moving the sight leaf 6, and, as shown in Figs. 2 and 3, consists of a dove-tail connection with the tongue portion 12 forming a part of the sight leaf 6 and the groove 13 formed in the sight base 9. The tongue of the sighting leaf is made to slidably engage the groove of the sight base. The sight assembly when connected to the sight base by the tongue and groove connection above mentioned, will, on the turning of the screw 14, cause the sight assembly to move up or down and laterally, the movement corresponding to the direction the screw is being turned. It will thus be seen that by incorporating the windage correction along the line 15, which forms an angle A with the horizontal in accordance with predetermined calculation, that the effect on the bullet due to the Magnus law will be compensated for.

In the foregoing description and in the drawing, we have limited our invention to one form of construction; but it must be understood that various embodiments may be made thereof without departing from the spirit of our invention.

What we claim as our invention and desire to secure by Letters Patent is 1. In a sight for firearms, a leaf having a peep sight and adjusting means for laterally and vertically moving said leaf for varying the apparent path of a rotating projectile in adjusting for Windage to compensate for the 5 Magnus effect on said projectile.

2. In a sight for rearms, a leaf, a Sight carried by said leaf, a support for said leaf and adjusting means interconnecting said leaf and support for bodily moving said leafl and sight in unison vertically and laterally to compensate for the Wind effect upon a rotating projectile.

In testimony whereof We aiiix our signatures.

HENRY B. INGLIS.

CHARLES L. PAULUS.

ROBERT KAUCH. 

